Being a non quilter I've always wondered this too. Particularly when an official bod answered my query with "the usual two layers" - errrrrrm I thought "the usual" was THREE layers. Then someone went to a show and came back and told me there was a piece made up of broken china...
I'm on blogger as well and I'm really pleased. I'm a fairly new blogger (since March) and it has been really easy to set up, edit and add gadgets as needed. Good luck with your project. My blog can be found at htttp://SewDanish.blogspot.com if you want to have a look. Birgitte